perf: add object pooling and enhanced metrics for streaming optimization

- Implement gRPC/shred connection pools for memory efficiency
- Add atomic processing time stats with auto-calibration clock
- Optimize event parsers and protocol handlers
- Refactor metrics system for advanced performance monitoring

src/streaming/common/config.rs

@@ -26,7 +26,7 @@ pub struct BackpressureConfig {
 
 impl Default for BackpressureConfig {
     fn default() -> Self {
-        Self { permits: 1, strategy: BackpressureStrategy::default() }
+        Self { permits: 3000, strategy: BackpressureStrategy::default() }
     }
 }